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Approach

Import the SOBEK 2 model into SOBEK 3 and choose features

Procedure:

• Start with the SOBEK 2 channel flow module.
  • Modify the SOBEK 2 model in such a way that the corresponding SOBEK 3 model produce the same results, or that all differences in results can be explained.
  • Finalize the 1D flow model by manual modifications.
• Continue with the rainfall-runoff module.
• Continue with the water quality module.

1D flow

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Clean up the SOBEK 2 model

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1D flow

First clean up the SOBEK 2 model with the Cleanup Utility:

Import to SOBEK 3

Now create a SOBEK 2 model that can be imported in such a way that there is no difference between the SOBEK 2  model and the SOBEK 3 model with regards to the contents.

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• The initial value 0 of PID controller <id> will not be used. The defined structure dimension is the initial value:
  • In SOBEK 3 you can’t define an initial value of the PID therefor the initial structure setting are used as initial value.
• The initial value -5.37 of PID controller <id> will not be used. The defined structure dimension is the initial value
  • In SOBEK 3 you can’t define an initial value of the PID therefor the initial structure setting are used as initial value.
• Case setting CrestlevelOpeningsHeight cannot be imported, model parameter setting not available.
• Case setting StructureDynamicsFactor cannot be imported, model parameter setting not available.
• Case setting Steady cannot be imported, model parameter setting not available.
• Computational grid import: 1 grid points were skipped in branch '<id>' because there are structures defined at these locations.
  • There is no longer a gridpoint on structures necessary.
• Friction data of definition <id> of cross-section <id> has not been found. The main bed of branch <id> is used as roughness data.
  • This warning is related to a network element that is no longer available in the model after it has been deleted by a user.
• Friction BDFR <id> is linked to branch definition <id> without any tabulated, standard or river profiles; ignored.
• Friction BDFR <id> is linked to branch that does not exist (id 0); ignored.
• No location with id = <id> found

Compare simulation results and modify model data

Run a simulation with your modified SOBEK 2 model with the channel flow module only.

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Modify the SOBEK 2 model in such a way that the corresponding SOBEK 3 model produces the same results. This is not possible in all cases (Meijer, 2015).

Finalization 1D-Flow

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Preface

Within the finalization phase, features that could not be imported from the original SOBEK 2 model must be added:

• For lateral stations where the inflow is computed with the rational method, corresponding objects must be modelled in a Rainfall-Runoff model.
• Open water nodes from the rainfall-runoff module must be schematized in the D-Flow 1d network.
• Hydraulic structures from the rainfall-runoff module must be added to the D-Flow 1d network. 

If the model has a long history, modify your model according to good modeling practice:

• Remove so-called "Preismann-slots" from all cross-sections.

Consider to use the scripting feature of SOBEK 3. Example scripts are delivered with SOBEK 3.

Lateral stations in 1D-Flow with rational method

If your SOBEK 2 1D-Flow model contains lateral stations that get inflow from rainfall-runoff features like

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• Add a new model to the project: 
  • right mouse-click on the project, choose "New Model...": 
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• Select "Rainfall Runoff Model"
• Move it to integrated model 
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• Import precipitation data (a *.bui file) from your SOBEK 2 model
• Create catchments
• modify the open water property
  • fill in the catchment area
  • choose the appropriate Rainfall Station (corresponds to the precipitation data)
• connect the catchment to the corresponding lateral node in the water flow 1d network.

Finalization

Add features that could not be imported from the original SOBEK 2 model:

• Open water nodes from the rainfall-runoff module must be schematized in the D-Flow 1d network.
• Hydraulic structures from the rainfall-runoff module must be added to the D-Flow 1d network. 

If the model has a long history, modify your model according to good modeling practice:

• Remove so-called "Preismann-slots" from all cross-sections.

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• .

References

Meijer, D. (2015): Results acceptance test FLOW 1D and RTC SOBEK 3. Deltares draft report 1205718-000-DSC-0124-v1.

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